Which of the following reagents can dist...

Which of the following reagents can distinguish between propene and propyne?
(i) `Na` (in hexane)
(ii) `Na^(+)NH_2` (in liquid `NH_3`)
(iii) `Ag(NH_3)_2^(+)OH^(-)`
(iv) `Cu(NH_3)_2^(+)OH^(-)`

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